Be very, very cautious about stem cell clinics. I have investigated and written for my PWP group about a few clinics that are nothing more than organized crime.
If you are considering stem cell treatment in any one of the 900 stem cell clinics worldwide that cater to "neuro tourists", here are some early warning signs that should cause you to run in the opposite direction:

Claims based on patient testimonials. Patients want to believe so much that a treatment is helping them that they can convince themselves that it has. They may even have experienced some recovery unrelated to the treatment. Unless there has been carefully evaluated clinical research it is very difficult to know what is a true effect of the treatment and what you can expect.

Multiple diseases treated with the same cells. Unless the diseases are related, such as all being diseases of the blood, different diseases, such as Parkinson’s disease and heart disease, would be expected to have very different treatments. Also, you want to be treated by a doctor that is a specialist in your disease.

The source of the cells or how the treatment will be done is not clearly documented. This should be clearly explained to you in a treatment consent form. In addition, there should be a ‘protocol’ that outlines the treatment in detail to the medical practitioner. The protocol is the ‘operating manual’ for the procedure. While it may not be made available to you automatically, you should be able to request this. For a clinical trial or experimental treatment, protocols should have been reviewed for scientific merit by independent experts and approved by an ethics committee to ensure that the rights and well-being of the participants will be respected. Ask who has approved this protocol and when the approval expires.

Claims there is no risk. There is always risk involved with treatment. Information about the possible risks should be available from preclinical or earlier clinical research.

High cost of treatment or hidden costs. It is not customary for someone to pay to be in a clinical trial (other than perhaps travel and other personal expenses). Consider whether you should pay for a treatment that is unproven. Furthermore, ask about the costs of emergency medical care if something goes wrong, particularly if you are outside your own country. Find out what costs your national health program or health insurance provider will cover, in what circumstances and in what countries.